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Test methodology and wear characteristics of austenitic stainless steel aisi type 316 at cryogenic environment

Farrahi, G. H ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. Components in cryogenic milieu with relative motion, like seals and pumps cannot be lubricated by using oils or other lubricants. Therefore materials wear in cryogenic condition is a great concern. To earn valid data about the wear properties of common and super useful material in cryogenic tribosystems, reconstruction wear test apparatus at cryogenic temperature is needed. Investigations on metal-metal couple show that austenitic stainless steels have favorable and auspicious sliding properties at cryogenic temperature. This research provides the wear parameters of austenitic stainless steel AISI type 316 in cryogenic environment. For this purpose two sets of test environment are prepared, room temperature (273K) and 77K with the sample immersed in LN2 using designed Pin-On-Disk cryogenic simulator. Disk material is austenitic stainless steel AISI type 316L and pin is bearing steel SAE 52100. Test is chosen to have 20.1 m/s sliding speed and two pin normal forces, ION and 20N. Test results show reduction in friction coefficient (average COFcryogenic : 0.15 - average COF RoomTemperature : 0.5) and lower wear rate in cryogenic environment. Better wear resistance properties is achieved, because austenitic stainless steels have higher mechanical strength in cryogenic condition and the forming of nitride layer at worn surfaces which enhances slipping of pin on the specimen. The wear rate in experiments reported to be approximately 4-10 (mm3/Nm). Like friction coefficient, the same trend has been observed on wear rate between specimen in room temperature and cryogenic condition. The major mechanism of wear is severe abrasion in room temperature, by considering SEM micrographs of worn surfaces. Contrary, mild abrasive wear mechanism is observed in specimens tested under the cryogenic condition
  4. Keywords:
  5. Cryogenic ; Stainless steel ; Wear ; Abrasion ; Austenitic stainless steel ; Friction ; Testing ; Tribology ; Wear of materials ; Wear resistance ; Cryogenic conditions ; Cryogenic environment ; Cryogenic temperatures ; Friction coefficients ; Mild abrasive wears ; Resistance properties ; Sliding properties ; Wear characteristics ; Cryogenics
  6. Source: Lecture Notes in Engineering and Computer Science ; Vol. 2 , 2-4 July , 2014 , pp. 1214-1217 ; ISSN: 20780958 ; ISBN: 9789881925350
  7. URL: https://doaj.org/article/fa341629320d403da388664cdba8827d